L20 SERIESService andRepair Manual

HELIC

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2

Introduction

Table of Contents .................................................................................................................... 2

Product Introduction ................................................................................................................ 3

General Safety Guidelines ....................................................................................................... 3

Product Identification ............................................................................................................... 4

Theory of Operation................................................................................................................. 5

Tools

Tools Required ........................................................................................................................ 6

Drawings and Spare Parts

Spare Parts ............................................................................................................................. 7

Assembly Drawing .................................................................................................................. 8

Exploded View ......................................................................................................................... 9

Parts List ............................................................................................................................... 10

Disassembly

Before Disassembly .............................................................................................................. 11

Disassembly ......................................................................................................................... 11

Inspection .............................................................................................................................. 17

Assembly

Assembly............................................................................................................................... 18

Post Assembly

Greasing Thrust Washers ..................................................................................................... 23

Testing the Actuator .............................................................................................................. 24

Installation and Bleeding ........................................................................................................ 25

Troubleshooting Guide .......................................................................................................... 26

Standard Helac Corporation Warranty .................................................................................. 27

Return and Debit Policy ......................................................................................................... 27

About Helac Corporation ........................................................................................................ 32

Table of Contents

3

Many L20 actuator applications have several pinchpoints with the potential for severe injuries. Use ex-treme caution and remain clear of all rotating compo-nents when bleeding the hydraulic system and when-ever the machine is in operation.

After rebuilding or repairing an actuator, it is necessaryto bleed all air from the actuator as well as the hydraulicsystem of the machine. See page 25 for bleedinginstructions.

Exercise extreme caution while bleeding theactuator -- keep hands, fingers, and other limbs asafe distance from all rotating components.

Product Introduction

For over 30 years, Helac Corporation has beenrecognized for innovation in design of hydraulicrotary actuators and construction equipmentattachments. Helac products are reknowned fortheir tremendous torque output, compact con-figurations, exceptional load bearing capabili-ties, and rugged, reliable performance. Over1,000 mobile, industrial, construction and miningmachinery manufacturers around the world de-pend on Helac actuators to perform such func-

tions as rotation, positioning, manipulation, ve-hicle steering and indexing. Helac's L20 Seriesrotary actuators are used widely to rotateworkplatforms on self-propelled aerial lifts wherethey have become the industry standard.The L20 Series is available in different sizes andvarious mounting configurations (for more de-tails see page 4).

General Safety Guidelines

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Each Helac actuator is individually serial num-bered. The serial number is a five or six digitnumber and must be provided before parts and/or service issues can be addressed.The serial number can be found on the Identifica-tion (ID) Tag that is affixed to all actuators. Thetag is a thin, silver colored, plastic material witha self-adhesive backing. Information is imprintedin black. The tag is located either on the side plateor on the housing tube of the actuator. In somecases, the ID tag may be painted over by theOEM (Original Equipment Manufacturer). Typi-

01234501/02/03

67890A3000H

L20-8.2S-27681 P/N 0060063

cal sample tag locations are seen below. Notethat the model number may begin with either"HP" or "L20".Additionally, the serial number of the actuator isstamped onto the side plate or the housing tube.It may be necessary to remove paint to exposethe serial number.If the ID tag is not attached to the actuator and/orthe stamped serial number cannot be located,the basic actuator model can be identified bymeasuring the outer diameter of the drilled andtapped shaft flange.

Model Flange DiameterL20-4.5 4.10” (104.14 mm)L20-8.2 4.60” (116.84 mm)L20-15 5.60” (142.24 mm)L20-25 6.70” (170.18 mm)L20-30 7.20” (182.88 mm)L20-39 7.70” (195.58 mm)

Product Identification

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The L20 Series rotary actuator is a simplemechanism that uses Helac's sliding spline tech-nology which converts axial piston motion intopowerful shaft rotation. As seen in the illustra-tion below left, each actuator is composed of ahousing with an integral ring gear (1) and onlytwo moving parts: the central shaft (2), and theannular piston sleeve (3). Note the L20 actuatorshaft features an integral mounting flange andbearing which are not shown in the illustration.Helical spline teeth machined on the shaft en-gage matching splines on the inside diameter ofthe piston. The outside diameter of the pistoncarries a second set of splines, of opposite hand,which engage the matching splines of thehousing's ring gear.As hydraulic pressure is applied, the piston is dis-placed axially within the housing - similar to theoperation of a hydraulic cylinder - while, simulta-neously, the splines cause the shaft to rotate. Whenthe control valve is closed, oil is trapped inside thehousing, preventing piston movement and lockingthe shaft firmly in position.

The shaft is supported radially by the large up-per radial bearing and the lower radial bearing(see drawings on pages 8 and 9). Axially, theshaft is separated from the housing by the up-per and lower thrust washers. The end cap isadjusted for axial clearance and locked in posi-tion by set screws or pins.The L20 Series is available in several differentsizes. All L20 Series actuators have the sameinternal design and basic components, thoughconfigurations of parts may be slightly differentdepending on model.Many L20 actuators are equipped with factoryinstalled counterbalance valves, whichperforms four major functions.• Protects the actuator in the event of overload• Enables the actuator to hold position without

drifting when external loads are applied• Reduces hydraulic backlash by pressuring

the hydraulic fluid• Provides a constant controlled rate of

rotation in over-center load conditions

Theory of Operation

Bars indicate starting positions ofpiston and shaft. Arrows indicatedirection they will rotate. Thehousing with integral ring gearremains stationary. For clarity,the shaft flange, bearings, andend cap are not shown.

Applying fluid pressure willdisplace the piston axially whilethe helical gearing causes thepiston and shaft to rotatesimultaneously. The double helixdesign compounds rotation:shaft rotation is about twice thatof the piston. Applying pressureto the opposite port will returnthe piston and shaft to theiroriginal starting positions.

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2

1

6

MAKING A SEAL TOOL

The seal tool is merely a customizedstandard flat head screwdriver.1. Heat the flat end with a torch until it

glows.2. Secure the heated end of the screw-

driver in a vise and bend the heated endto a slight radius.

3. Round off all sharp edges of the heatedto a polished finish. The tool may bemodified slightly to your own personalpreference.

Tools Required

1.

2.3.

4.

5.

6.

7.

8.

16.

15.

14.13.

12.

10.

11.9.

Several basic tools are required for the disassemblyand reassembly of the actuator. The tools and theirintended functions are outlined below:

1. PIPE VISE

2. HEX WRENCHRemoval and replacement of port plugs and setscrews.

3. ASSORTED SCREWS

4. SAFETY GLASSES

5. END CAP REMOVAL TOOLS (provided withHelac seal kit).

6. DRILL

7. FLASHLIGHTHelps in locating and examining timing marks,component failure and overall condition.

8. RUBBER MALLETRemoval and installation of shaft and pistonsleeve assembly.

9. PLASTIC MANDREL

10. PRY BARRemoval of end cap and manual rotationof shaft.

11. FELT MARKERHighlights timing marks and outlines troubledareas. Permanent ink is recommended.

12. T-HANDLE SCREW EXTRACTOR

13. HEX WRENCH SETRemoval and replacement of port plugs and setscrews (106,110).

14. SEAL TOOLSRemoval and installation of seals and wearguides. Directions on making a seal tool areprovided at bottom.

15. PUNCH

16. DOWEL PINSRemoval and installation of end cap.

6.

1.

2.3.

4.

8.

7.

9. 10.

5.

11.12. 13.

14. 15.16.

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Spare parts must be ordered through the ve-hicle/machine OEM. Seals and bearings areavailable as complete kits only! In order to obtainthe correct parts, it is essential to provide theserial number of the actuator to be repaired, see

Product Identification section on page 4. Toidentify spare parts required, refer to the Assem-bly Drawing on page 8 and Parts List on page 10.

Spare Parts

Technical support is available from Helac Corporation, Monday through Friday 7 am to 4 pmPacific Standard Time by calling 800-327-2589. If possible, please have the serial number of theactuator available. (The serial number is stamped into the housing of the actuator-see page 4).

Spare PartsTechnical Support

8

Typical L20 Series ActuatorClevises and/or Output Shaft Flange Configurations May Be Different

Assembly Drawing

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Exploded View

10

PartsITEM DESCRIPTION QUANTITY1 HOUSING 1

2 SHAFT 1

3 PISTON SLEEVE 1

4 END CAP 1

HardwareITEM DESCRIPTION QUANTITY103.1 SCREW (OPTIONAL) 1

103.2 WASHER (OPTIONAL) 1

106.1 PORT PLUG 1

106.2 PORT PLUG 1

109 LOCK PIN 2

113 SET SCREW 6

HYDRAULIC FLUID: ISO-VG-46

SealsITEM DESCRIPTION QUANTITY200 T-SEAL 1

202 T-SEAL 1

204 O-RING 1

205 CUP SEAL 2

207 BACK-UP RING 1

304.1 EXCLUSION SEAL 2

BearingsITEM DESCRIPTION QUANTITY302 WEAR GUIDE 2

304 THRUST WASHER 2

AccessoriesITEM DESCRIPTION QUANTITY400 STOP TUBE (OPTIONAL) 1

401 COUNTERBALANCE VALVE 1

403 MOTION CONTROL VALVE 1

Parts ListSpare PartsSpare parts must be ordered through the vehicle/machine OEM. Seals and bearings are available as complete kitsonly! In order to obtain the correct parts, it is essential to provide the serial number for the actuator to be repaired.See Product Identification on Page 4. To identify spare parts required, refer to the Assembly Drawing, ExplodedView Drawing and the Parts List.

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Inspect the actuator for corrosion prior todisassembly. Severe corrosion can makeit difficult to remove the lock pins (109) andunthread the end cap (04). If corrosion isevident, soak the lock pins and end capwith penetrating oil for several hours be-fore disassembling.Disassembly is considerably easier if theactuator is firmly secured to the workbench. A pipe vise or mounting fixturework well.

Before Disassembly

Disassembly

1. Remove port plugs (106.1) (106.2) and drainoil. Inspect oil for signs of contamination, i.e.water, metal shavings.

2. Remove the cap screws (113) that cover theend cap lock pins (109).

3. Using a 1/8” (3 mm) drill bit, drill a hole in thecenter of each lock pin to a depth ofapproximately 3/16” (5 mm).

Before Disassembly

All numbers that appearin parenthesis ( ) referto items in parts list onpage 10.

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6. Using a metal bar or similar tool, unthread theend cap (4) by turning it counterclockwise.

4. Remove the lock pins using a screw extractingtool such as an “Easy Out” (a size #2 isshown).

If the pin cannot be removed with the screwextractor, use a 5/16” bit to drill out the entirepin. Do not drill deeper than 1/2” (12.7 mm).

5. Install the end cap removal tools provided withthe Helac seal kit. (1/4-20)

7. Remove the end cap (4) and carefully setaside for later inspection.

Disassembly

13

10. Prior to removing the shaft (2), use a feltmarker to clearly indicate the timing betweenshaft and piston sleeve (3). This will greatlysimplify timing when the actuator is reas-sembled.

9. Every actuator has two sets of smallpunched timing marks that indicate timingbetween the gear sets. The location andappearance of the marks can vary slightlybetween models. One set indicates thetiming between the piston sleeve (3) and thehousing (1) (photo at left), the second setbetween the piston and the shaft (lowerphoto). To ensure correct rotation and accu-rate end positions, it is essential that theactuator be correctly timed when it is reas-sembled. The punched timing marks can beused, but it is easier to highlight punchedmarks with a marker before disassembly asoutlined in the steps below.

8. Remove the stop tube (400) if the actuator isequipped with one. The stop tube is anavailable option that limits the rotation of theactuator.

Disassembly

14

12. As in step 9 above, before removing thepiston (3), mark the housing (1) ring gear inrelation to the piston outside diameter gear.There should now be timing marks on thehousing (1) ring gear, the piston (3) and theshaft (2).

13. To remove the piston (3) use a rubber malletand a plastic mandrel so the piston andhousing bore are not damaged.

11. Remove the shaft (2) by rotating counter-clockwise. As the shaft is rotated, it willdisengage from the piston sleeve (3) and canbe removed. It may be necessary to strikethe threaded end of the shaft with a rubbermallet.

14. At the point when the piston gear teeth comeout of engagement with the housing gearteeth, mark the piston and housing with amarker as shown.

Disassembly

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18. Remove the thrust washer (304) from the endcap (4) and shaft (2).

16. Remove the wear guide (302) from the endcap (4) and shaft (2).

17. Remove the main pressure seal (205).

15. Remove the O-ring (204) and backup ring(207) from end cap (4).

Disassembly

16

20. Remove the outside diameter piston seal(202) from the piston.

21. Remove the inside diameter piston seal(200).

19. Remove the O-ring (304.1) from itsgroove in the end cap (4) and shaft (2).

Disassembly

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Inspection

1. Clean all parts in a solvent tank and dry withcompressed air prior to inspecting.

2. Carefully inspect all critical areas for anysurface finish abnormalities: Seal grooves,bearing grooves, thrust surfaces, shaftsurface, housing bore and gear teeth.

Prior to assembly of actuator,these steps must be closelyfollowed to insure proper operationof the actuator.

Small or minor surface scratchescan be carefully polished.

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1. Gather all the components and tools into onelocation prior to re-assembly. Use the cutaway drawing to reference the seal orienta-tions.

2. Coat the thrust washers (304) with a gener-ous amount of Lithium grease. Install thethrust washer (304) onto shaft (2) and endcap (4).

3. Install the exclusion seal (304.1) into theappropriate grooves on the shaft (2) and endcap (4) around the outside edge of the thrustwasher (304).

Assembly

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5. Install the wear guide (302) on the end cap(4) and shaft (2).

7. Install the inner T-seal (200) into the appropri-ate groove in the piston (3). Use a circularmotion to insure the seal is correctly seatedin the groove.Install the outer T-seal (202) by stretching itaround the groove in a circular motion.Each T-seal has 2 back-up rings (see As-sembly Drawing on page 8 for orientation).

Assembly

6. Install the O-ring (204) and back-up ring(207) into the inner seal groove on the endcap (4).

4. Using a seal tool (see Tools Required onpage 6) install the main pressure seal (205)onto shaft (2) and end cap (4). Use the sealtool in a circular motion.

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9. Looking into the housing bore from the shaftflange end, rotate the piston (3) until themarks you put on the piston and the housing(1) during disassembly align as shown. Usinga rubber mallet, tap the piston into the hous-ing until the gear teeth contact.

10. Looking into the bore from the opposite endof the housing (1) be sure the timing marksalign correctly. Rotate the piston as neces-sary until aligned, then gently tap the piston(3) into the housing until the gear teeth meshtogether. Tap the piston into the housing untilit completely bottoms out against the ringgear.

Assembly

8. Insert the piston (3) into the housing (1) asshown, until the outer piston seal (202)contacts the inside housing bore.

(cont'd) Beginning with the inner seal (200)insert one end of backup ring in the lowergroove and feed the rest in using a circularmotion. Make sure the wedged ends overlapcorrectly.

Insert the other back up ring in upper groove.

Repeat both of these steps for the outer seal(202).

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13. Install two bolts in the threaded holes in theflange. Using a metal bar, rotate the shaft in aclockwise direction until the wear guides areseated inside the housing bore.

14. Install the stop tube (400) onto the shaft endif necessary. Stop tubes are an availableoption to limit the rotation of an actuator.

Assembly

As the shaft is rotated, be carefulnot to disengage the piston andhousing gearing.

12. Looking at the actuator from the end oppositethe shaft flange, use the exisitng timingmarks to align the gear teeth on the shaft (2)with the gear teeth on the inside of the piston(3). When the marks align, gently tap theflange end of the shaft with a rubber malletuntil the gear teeth engage.

11. Insert the shaft (2) into the piston (3). Becareful not to damage the piston seals. Donot engage the piston gear teeth yet.

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16. Thread the end cap (4) onto the shaft (2).Make sure the wear guide remains in placeon the end cap as it is threaded into thehousing (1).

17. Tighten the end cap (4) using a metal bar. Inmost cases the original holes for the lockpins will align.

18. Insert the lock pins (109) provided with theHelac seal kit into the holes with the dimpleside up. Then, using a punch, tap the lockpins to the bottom of the hole.

15. Coat the threads on the end of the shaft withanti-seize grease to prevent galling.

Assembly

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1. After the actuator is assembled but before itis put into service, the thrust washer areamust be packed with Lithium grease.

There are two grease ports located on boththe shaft flange and the end cap. They areplugged with cap screws (113) or setscrews. Remove the grease port screwsfrom the shaft flange and end cap. (Seeexploded view on page 9)

If a hydraulic test bench is notavailable, the actuator can berotated by hand, open the pressureports and use a pry bar with capscrews inserted into the shaftflange to turn the shaft in thedesired direction.

Insert the tip of a grease gun into one port andapply grease to the shaft flange. Continueapplying until grease flows from the oppositeport. Cycle the actuator five times and applygrease again. Repeat this process on the endcap. Insert the cap screws into the greaseports and tighten to 25 in-lbs. (2.8 Nm).

19. Insert the set screws (113) over the lockpins. Tighten to 25 in-lbs. (2.8 Nm).

Greasing Thrust Washers

Assembly

24

Testing the Actuator

If the equipment is available, the actuatorshould be tested on a hydraulic test bench.The breakaway pressure — the pressure atwhich the shaft begins to rotate — should beapproximately 400 psi (28 bar). Cycle theactuator at least 25 times at 3000 psi (210bar) pressure. After the 25 rotations, increasethe pressure to 4500 psi (315 bar) to checkfor leaks and cracks. Perform the test again atthe end of the rotation in the oppositedirection.

Testing the Actuator forInternal LeakageIf the actuator is equipped with with acounterbalance valve, plug the valve ports.Connect the hydraulic lines to the housingports. Bleed all air from the actuator (seeInstallation and Bleeding on page 25) Rotatethe shaft to the end of rotation at 3000 psi (210bar) and maintain pressure. Remove thehydraulic line from the non-pressurized side.

Continuous oil flow from the open housing portindicates internal leakage across the piston.Replace the line and rotate the shaft to the endof rotation in the opposite direction. Repeat thetest procedure outlined above for the otherport. If there is an internal leak, disassemble,inspect and repair.

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After installation of the actuator on the equip-ment, it is important that all safety devices suchas tie rods or safety cables are properly reat-tached.To purge air from the hydraulic lines, connectthem together to create a closed loop and pumphydraulic fluid through them. Review the OEM’soperating manual and/or hydraulic schematic todetermine which hydraulic lines to connect. Thelinear feet and inside diameter of the hydraulicsupply lines together with pump capacity willdetermine the amount of pumping time requiredto fully purge the hydraulic system.

Bleeding may be necessary if excessive back-lash is exhibited after the actuator is connectedto the hydraulic system. The OEM does notspecify all actuators with bleed nipples, see thedrawing below for their location. The followingsteps are recommended when a minimum of twogallons (8 liters) is purged.

1. Connect a 3/16” inside diameter x 5/16” out-side diameter x 5 foot clear, vinyl drain tubeto each of the two bleed nipples. Secure themwith hose clamps. Place the vinyl tubes in aclean 5-gallon container to collect the purgedoil. The oil can be returned to the reservoirafter this procedure is completed.

2. With an operator in the platform, open bothbleed nipples a ¼ turn. Hydraulically rotatethe platform to the end of rotation (eitherclockwise or counterclockwise), and main-tain hydraulic pressure. Oil with small airbubbles will be seen flowing through thetubes. Allow a ½ gallon of fluid to be purgedfrom the actuator.

3. Keep the fittings open and rotate the platformin the opposite direction to the end position.Maintain hydraulic pressure until an addi-tional ½ gallon of fluid is pumped into thecontainer.

4. Repeat steps 2 & 3. After the last ½ gallon ispurged, close both bleed nipples before rotat-ing away from the end position.

Installation and Bleeding

TYPICAL CONFIGURATION OFACTUATOR USED FOR WORKPLATFORM ROTATION

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PROBLEM SEE CAUSES AND SOLUTIONS BELOWShaft rotates slowly or not at all 1 - 6

Operation is erratic or not responsive 7

Shaft will not fully rotate 8, 9

Selected position cannot be maintained 3, 4, 7

CAUSE SOLUTION1. Insufficient torque output Verify correct operating pressure. Do not exceed

OEM's pressure specifications. Load may beabove maximum capacity of the actuator.

2. Low rate of fluid flow Inspect ports for obstructions and hydraulic linesfor restrictions and leaks.

3. Disconnect hydraulic lines and bypass valve.Leave valve ports open and operate the actuatorthrough housing ports (do not exceed OEM'soperating pressure). The valve must be replacedif a steady flow of fluid is seen coming from thevalve ports.

4. Piston and/or shaft seal leak Remove the plug and the housing's valve ports.Operate the actuator through the housing ports.Conduct the internal leakage test as described inthe Testing section on page 24 of this manual.

5. Corrosion build-up on the Re-build the actuator. Remove all rust then polish.*thrust surfaces

6. Swollen seals and composite bearings Re-build the actuator. Use fluid that is compatiblecaused by incompatible hydraulic fluid with seals and bearings. Contact Helac Corporation(Standard actuators only) for more information.

7. Air in actuator Purge air from actuator. See bleeding proceduresoutlined on page 25.

8. Twisted or chipped gear teeth Check for gear binding. Actuator may not be ableto be re-built and may need to be replaced. Damagecould be a result of overload or shock.

9. Port fittings are obstructing the piston Check thread length of port fittings. Fittings shouldduring stroke not reach inside the housing bore.

Troubleshooting Guide

Control or counterbalancevalve has internal leak

* Replacement parts may be needed.

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Rev 02-2005

Hydraulic Rotary Actuator Product Warranty

Standard Warranty InformationHelac Corporation warrants its manufactured products to be free from defective material and factory workmanship.Helac Corporation shall replace or repair such products, which under normal use and service disclose suchdefects, and return the repaired or replacement products to the purchaser prepaid. Claims under this warranty willbe satisfied only by repair or replacement of the unit or any defective part thereof. No cash payment or credit will bemade for defective materials, workmanship, labor or incidental charges. Products under warranty shall be returnedto Helac Corporation’s manufacturing facility at 225 Battersby Avenue, Enumclaw, Washington 98022 USA,transportation prepaid by the purchaser, for inspection by Helac Corporation, whose opinion as to defects shall beconclusive.

The warranty period shall be 12 months from the date of shipment from Helac Corporation’s manufacturing facilityfor Helac Corporation approved applications. This warranty shall be voided as to any products which have beenrepaired, worked upon, or altered by persons not authorized by Helac Corporation, or which have been subject tomisuse, negligence, accident, or overload. In no event shall Helac Corporation be liable for any incidental orconsequential damages.

Helac Corporation reserves the right to make changes in the design or construction of any of its products at anytime without incurring any obligations to make changes or alterations to products previously sold.

This warranty is in lieu of all other and/or prior warranties, expressed or implied, and no other company or person isauthorized to represent or assume for Helac Corporation any liability in connection with the sale of HelacCorporation products other than set forth herein.

Return and Debit Policy for ActuatorsUnless agreed to in advance, all actuators will be shipped to Helac Corporation, freight prepaid within seven daysafter receipt of return authorization. Prior to any returns, a Return Material Authorization (RMA) form is to berequested from an authorized Helac Corporation representative. Upon receipt of the RMA form, the customer is toprovide when applicable, the part number, serial number, failure date, description of problem and the customerclaim or reference number. All shipments to Helac Corporation are to include the completed RMA form.

Upon receipt of the actuator(s) at the Helac Corporation facilities, an inspection will be performed and anauthorized representative will provide a written quote. This quote will list the findings of the inspection and will statewhether or not the warranty claim has been accepted. Actuators returned for credit may be subject to the HelacCorporation re-stocking fee.

If Helac Corporation does not receive a response to their quote within 30 calendar days, the actuator will be eitherscrapped or returned and an invoice for the debit amount, including the freight charges, will be sent to the claimoriginator.

Return and Debit Policy for Service PartsReturn of service parts, normally stocked by Helac Corporation, must be authorized in advance. This will includeseal and bearing kits as well as any and all fabricated parts. Return of any special order parts will be authorized ona case-by-case basis. All returns are to be shipped to Helac Corporation freight prepaid within seven days afterreceipt of return authorization. Helac Corporation has a minimum re-stocking fee of 20 percent.

Prior to any returns, Return Material Authorization (RMA) form is to be requested from an authorized HelacCorporation representative. Upon receipt of the RMA form, the customer is to provide part number, receipt date,description of problem and the customer claim number. All shipments to Helac Corporation are to include thecompleted RMA form.

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Notes

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Notes

Notes

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Notes

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HELAC CORPORATION225 BATTERSBY AVENUE • ENUMCLAW, WA 98022 USAPHONE 360.825.1601 • FAX 360.825.1603 • www.helac.com®

Rev

02-

2005

About Helac Corporation

As a leader in the fluid power industry for over30 years, Helac Corporation manufactures acomprehensive line of hydraulic rotaryactuators used as component parts for OEMsand aftermarket attachments for theconstruction equipment industry. Helac rotaryactuators are best known for their tremendoustorque output, compact dimensions,

exceptional load bearing capability and rugged,reliable performance. Helac PowerTilt andPowerGrip, two specialty products, increasethe utilization of backhoes and excavators.Over 1,000 worldwide customers in diversemarkets depend on Helac's product line toprovide product quality, reliability, ease of useand durability.